Okay, if America actually was founded on Christian values, that would be a fair argument. I personally don't believe it was founded on Christian values and was taught that in church, but not in school.
The 1797 Treaty of Tripoli says this “As the Government of the United States of America is not, in any sense, founded on the Christian religion; as it has in itself no character of enmity against the laws, religion, or tranquillity, of Mussulmen.....
It was signed off by President John Adams in 1797 and ratified unanimously by the senate.
https://en.wikipedia.org/wiki/Treaty_of_Tripoli